1 /* $OpenBSD: ip6_input.c,v 1.168 2016/08/24 09:41:12 mpi Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include "pf.h" 65 #include "carp.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/mbuf.h> 70 #include <sys/domain.h> 71 #include <sys/sysctl.h> 72 #include <sys/protosw.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/errno.h> 76 #include <sys/time.h> 77 #include <sys/timeout.h> 78 #include <sys/kernel.h> 79 #include <sys/syslog.h> 80 #include <sys/task.h> 81 82 #include <net/if.h> 83 #include <net/if_var.h> 84 #include <net/if_types.h> 85 #include <net/route.h> 86 #include <net/netisr.h> 87 88 #include <netinet/in.h> 89 90 #include <netinet/ip.h> 91 92 #include <netinet/in_pcb.h> 93 #include <netinet/ip_var.h> 94 #include <netinet6/in6_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet/icmp6.h> 98 #include <netinet6/nd6.h> 99 100 #include <netinet6/ip6protosw.h> 101 102 #include "gif.h" 103 #include "bpfilter.h" 104 105 #ifdef MROUTING 106 #include <netinet6/ip6_mroute.h> 107 #endif 108 109 #if NPF > 0 110 #include <net/pfvar.h> 111 #endif 112 113 #if NCARP > 0 114 #include <netinet/ip_carp.h> 115 #endif 116 117 struct in6_ifaddrhead in6_ifaddr; 118 struct niqueue ip6intrq = NIQUEUE_INITIALIZER(IFQ_MAXLEN, NETISR_IPV6); 119 120 struct ip6stat ip6stat; 121 122 void ip6_init2(void *); 123 int ip6_check_rh0hdr(struct mbuf *, int *); 124 125 int ip6_hbhchcheck(struct mbuf *, int *, int *, int *); 126 int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 127 struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 128 129 static struct mbuf_queue ip6send_mq; 130 131 static void ip6_send_dispatch(void *); 132 static struct task ip6send_task = 133 TASK_INITIALIZER(ip6_send_dispatch, &ip6send_mq); 134 135 /* 136 * IP6 initialization: fill in IP6 protocol switch table. 137 * All protocols not implemented in kernel go to raw IP6 protocol handler. 138 */ 139 void 140 ip6_init(void) 141 { 142 struct ip6protosw *pr; 143 int i; 144 145 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 146 if (pr == NULL) 147 panic("ip6_init"); 148 for (i = 0; i < IPPROTO_MAX; i++) 149 ip6_protox[i] = pr - inet6sw; 150 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 151 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 152 if (pr->pr_domain->dom_family == PF_INET6 && 153 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW && 154 pr->pr_protocol < IPPROTO_MAX) 155 ip6_protox[pr->pr_protocol] = pr - inet6sw; 156 TAILQ_INIT(&in6_ifaddr); 157 ip6_randomid_init(); 158 nd6_init(); 159 frag6_init(); 160 ip6_init2(NULL); 161 162 mq_init(&ip6send_mq, 64, IPL_SOFTNET); 163 } 164 165 void 166 ip6_init2(void *dummy) 167 { 168 169 /* nd6_timer_init */ 170 bzero(&nd6_timer_ch, sizeof(nd6_timer_ch)); 171 timeout_set(&nd6_timer_ch, nd6_timer, NULL); 172 timeout_add_sec(&nd6_timer_ch, 1); 173 } 174 175 /* 176 * IP6 input interrupt handling. Just pass the packet to ip6_input. 177 */ 178 void 179 ip6intr(void) 180 { 181 struct mbuf *m; 182 183 while ((m = niq_dequeue(&ip6intrq)) != NULL) 184 ip6_input(m); 185 } 186 187 void 188 ip6_input(struct mbuf *m) 189 { 190 struct ifnet *ifp; 191 struct ip6_hdr *ip6; 192 struct sockaddr_in6 sin6; 193 struct rtentry *rt = NULL; 194 int off, nest; 195 u_int16_t src_scope, dst_scope; 196 int nxt, ours = 0; 197 #if NPF > 0 198 struct in6_addr odst; 199 #endif 200 int srcrt = 0; 201 202 ifp = if_get(m->m_pkthdr.ph_ifidx); 203 if (ifp == NULL) 204 goto bad; 205 206 if (m->m_flags & M_EXT) { 207 if (m->m_next) 208 ip6stat.ip6s_mext2m++; 209 else 210 ip6stat.ip6s_mext1++; 211 } else { 212 if (m->m_next) { 213 if (m->m_flags & M_LOOP) { 214 ip6stat.ip6s_m2m[lo0ifidx]++; /*XXX*/ 215 } else if (ifp->if_index < nitems(ip6stat.ip6s_m2m)) 216 ip6stat.ip6s_m2m[ifp->if_index]++; 217 else 218 ip6stat.ip6s_m2m[0]++; 219 } else 220 ip6stat.ip6s_m1++; 221 } 222 223 ip6stat.ip6s_total++; 224 225 if (m->m_len < sizeof(struct ip6_hdr)) { 226 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 227 ip6stat.ip6s_toosmall++; 228 if_put(ifp); 229 return; 230 } 231 } 232 233 ip6 = mtod(m, struct ip6_hdr *); 234 235 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 236 ip6stat.ip6s_badvers++; 237 goto bad; 238 } 239 240 #if NCARP > 0 241 if (ifp->if_type == IFT_CARP && ip6->ip6_nxt != IPPROTO_ICMPV6 && 242 carp_lsdrop(m, AF_INET6, ip6->ip6_src.s6_addr32, 243 ip6->ip6_dst.s6_addr32)) 244 goto bad; 245 #endif 246 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 247 248 /* 249 * Check against address spoofing/corruption. 250 */ 251 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 252 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 253 /* 254 * XXX: "badscope" is not very suitable for a multicast source. 255 */ 256 ip6stat.ip6s_badscope++; 257 goto bad; 258 } 259 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 260 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) && 261 (ifp->if_flags & IFF_LOOPBACK) == 0) { 262 ip6stat.ip6s_badscope++; 263 goto bad; 264 } 265 /* Drop packets if interface ID portion is already filled. */ 266 if (((IN6_IS_SCOPE_EMBED(&ip6->ip6_src) && ip6->ip6_src.s6_addr16[1]) || 267 (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst) && ip6->ip6_dst.s6_addr16[1])) && 268 (ifp->if_flags & IFF_LOOPBACK) == 0) { 269 ip6stat.ip6s_badscope++; 270 goto bad; 271 } 272 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 273 !(m->m_flags & M_LOOP)) { 274 /* 275 * In this case, the packet should come from the loopback 276 * interface. However, we cannot just check the if_flags, 277 * because ip6_mloopback() passes the "actual" interface 278 * as the outgoing/incoming interface. 279 */ 280 ip6stat.ip6s_badscope++; 281 goto bad; 282 } 283 284 /* 285 * The following check is not documented in specs. A malicious 286 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 287 * and bypass security checks (act as if it was from 127.0.0.1 by using 288 * IPv6 src ::ffff:127.0.0.1). Be cautious. 289 * 290 * This check chokes if we are in an SIIT cloud. As none of BSDs 291 * support IPv4-less kernel compilation, we cannot support SIIT 292 * environment at all. So, it makes more sense for us to reject any 293 * malicious packets for non-SIIT environment, than try to do a 294 * partial support for SIIT environment. 295 */ 296 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 297 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 298 ip6stat.ip6s_badscope++; 299 goto bad; 300 } 301 302 /* 303 * Reject packets with IPv4 compatible addresses (auto tunnel). 304 * 305 * The code forbids automatic tunneling as per RFC4213. 306 */ 307 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 308 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 309 ip6stat.ip6s_badscope++; 310 goto bad; 311 } 312 313 /* 314 * If the packet has been received on a loopback interface it 315 * can be destinated to any local address, not necessarily to 316 * an address configured on `ifp'. 317 */ 318 if (ifp->if_flags & IFF_LOOPBACK) { 319 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) { 320 src_scope = ip6->ip6_src.s6_addr16[1]; 321 ip6->ip6_src.s6_addr16[1] = 0; 322 } 323 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) { 324 dst_scope = ip6->ip6_dst.s6_addr16[1]; 325 ip6->ip6_dst.s6_addr16[1] = 0; 326 } 327 } 328 329 #if NPF > 0 330 /* 331 * Packet filter 332 */ 333 odst = ip6->ip6_dst; 334 if (pf_test(AF_INET6, PF_IN, ifp, &m) != PF_PASS) 335 goto bad; 336 if (m == NULL) 337 goto bad; 338 339 ip6 = mtod(m, struct ip6_hdr *); 340 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 341 #endif 342 343 /* 344 * Without embedded scope ID we cannot find link-local 345 * addresses in the routing table. 346 */ 347 if (ifp->if_flags & IFF_LOOPBACK) { 348 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) 349 ip6->ip6_src.s6_addr16[1] = src_scope; 350 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) 351 ip6->ip6_dst.s6_addr16[1] = dst_scope; 352 } else { 353 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) 354 ip6->ip6_src.s6_addr16[1] = htons(ifp->if_index); 355 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) 356 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 357 } 358 359 /* 360 * Be more secure than RFC5095 and scan for type 0 routing headers. 361 * If pf has already scanned the header chain, do not do it twice. 362 */ 363 if (!(m->m_pkthdr.pf.flags & PF_TAG_PROCESSED) && 364 ip6_check_rh0hdr(m, &off)) { 365 ip6stat.ip6s_badoptions++; 366 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, off); 367 /* m is already freed */ 368 if_put(ifp); 369 return; 370 } 371 372 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 373 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 374 ours = 1; 375 goto hbhcheck; 376 } 377 378 #if NPF > 0 379 if (pf_ouraddr(m) == 1) { 380 ours = 1; 381 goto hbhcheck; 382 } 383 #endif 384 385 /* 386 * Multicast check 387 */ 388 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 389 390 /* 391 * Make sure M_MCAST is set. It should theoretically 392 * already be there, but let's play safe because upper 393 * layers check for this flag. 394 */ 395 m->m_flags |= M_MCAST; 396 397 /* 398 * See if we belong to the destination multicast group on the 399 * arrival interface. 400 */ 401 if (in6_hasmulti(&ip6->ip6_dst, ifp)) 402 ours = 1; 403 #ifdef MROUTING 404 else if (!ip6_mforwarding || !ip6_mrouter) 405 #else 406 else 407 #endif 408 { 409 ip6stat.ip6s_notmember++; 410 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 411 ip6stat.ip6s_cantforward++; 412 goto bad; 413 } 414 goto hbhcheck; 415 } 416 417 418 /* 419 * Unicast check 420 */ 421 memset(&sin6, 0, sizeof(struct sockaddr_in6)); 422 sin6.sin6_len = sizeof(struct sockaddr_in6); 423 sin6.sin6_family = AF_INET6; 424 sin6.sin6_addr = ip6->ip6_dst; 425 rt = rtalloc_mpath(sin6tosa(&sin6), &ip6->ip6_src.s6_addr32[0], 426 m->m_pkthdr.ph_rtableid); 427 428 /* 429 * Accept the packet if the route to the destination is marked 430 * as local. 431 */ 432 if (rtisvalid(rt) && ISSET(rt->rt_flags, RTF_LOCAL)) { 433 struct in6_ifaddr *ia6 = ifatoia6(rt->rt_ifa); 434 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 435 m->m_flags |= M_ACAST; 436 /* 437 * packets to a tentative, duplicated, or somehow invalid 438 * address must not be accepted. 439 */ 440 if ((ia6->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED))) { 441 char src[INET6_ADDRSTRLEN], dst[INET6_ADDRSTRLEN]; 442 443 inet_ntop(AF_INET6, &ip6->ip6_src, src, sizeof(src)); 444 inet_ntop(AF_INET6, &ip6->ip6_dst, dst, sizeof(dst)); 445 /* address is not ready, so discard the packet. */ 446 nd6log((LOG_INFO, 447 "ip6_input: packet to an unready address %s->%s\n", 448 src, dst)); 449 450 goto bad; 451 } else { 452 /* this address is ready */ 453 ours = 1; 454 goto hbhcheck; 455 } 456 } 457 458 #if NCARP > 0 459 if (ifp->if_type == IFT_CARP && ip6->ip6_nxt == IPPROTO_ICMPV6 && 460 carp_lsdrop(m, AF_INET6, ip6->ip6_src.s6_addr32, 461 ip6->ip6_dst.s6_addr32)) 462 goto bad; 463 #endif 464 /* 465 * Now there is no reason to process the packet if it's not our own 466 * and we're not a router. 467 */ 468 if (!ip6_forwarding) { 469 ip6stat.ip6s_cantforward++; 470 goto bad; 471 } 472 473 hbhcheck: 474 475 if (ip6_hbhchcheck(m, &off, &nxt, &ours)) { 476 rtfree(rt); 477 if_put(ifp); 478 return; /* m have already been freed */ 479 } 480 481 /* adjust pointer */ 482 ip6 = mtod(m, struct ip6_hdr *); 483 484 /* 485 * Forward if desirable. 486 */ 487 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 488 /* 489 * If we are acting as a multicast router, all 490 * incoming multicast packets are passed to the 491 * kernel-level multicast forwarding function. 492 * The packet is returned (relatively) intact; if 493 * ip6_mforward() returns a non-zero value, the packet 494 * must be discarded, else it may be accepted below. 495 */ 496 #ifdef MROUTING 497 if (ip6_mforwarding && ip6_mrouter && 498 ip6_mforward(ip6, ifp, m)) { 499 ip6stat.ip6s_cantforward++; 500 goto bad; 501 } 502 #endif 503 if (!ours) 504 goto bad; 505 } else if (!ours) { 506 ip6_forward(m, rt, srcrt); 507 if_put(ifp); 508 return; 509 } 510 511 /* pf might have changed things */ 512 in6_proto_cksum_out(m, NULL); 513 514 ip6 = mtod(m, struct ip6_hdr *); 515 516 /* 517 * Tell launch routine the next header 518 */ 519 ip6stat.ip6s_delivered++; 520 nest = 0; 521 522 while (nxt != IPPROTO_DONE) { 523 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 524 ip6stat.ip6s_toomanyhdr++; 525 goto bad; 526 } 527 528 /* 529 * protection against faulty packet - there should be 530 * more sanity checks in header chain processing. 531 */ 532 if (m->m_pkthdr.len < off) { 533 ip6stat.ip6s_tooshort++; 534 goto bad; 535 } 536 537 /* draft-itojun-ipv6-tcp-to-anycast */ 538 if (ISSET(m->m_flags, M_ACAST) && (nxt == IPPROTO_TCP)) { 539 if (m->m_len >= sizeof(struct ip6_hdr)) { 540 icmp6_error(m, ICMP6_DST_UNREACH, 541 ICMP6_DST_UNREACH_ADDR, 542 offsetof(struct ip6_hdr, ip6_dst)); 543 break; 544 } else 545 goto bad; 546 } 547 548 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 549 } 550 rtfree(rt); 551 if_put(ifp); 552 return; 553 bad: 554 rtfree(rt); 555 if_put(ifp); 556 m_freem(m); 557 } 558 559 int 560 ip6_hbhchcheck(struct mbuf *m, int *offp, int *nxtp, int *oursp) 561 { 562 struct ip6_hdr *ip6; 563 u_int32_t plen, rtalert = ~0; 564 565 ip6 = mtod(m, struct ip6_hdr *); 566 567 /* 568 * Process Hop-by-Hop options header if it's contained. 569 * m may be modified in ip6_hopopts_input(). 570 * If a JumboPayload option is included, plen will also be modified. 571 */ 572 plen = (u_int32_t)ntohs(ip6->ip6_plen); 573 *offp = sizeof(struct ip6_hdr); 574 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 575 struct ip6_hbh *hbh; 576 577 if (ip6_hopopts_input(&plen, &rtalert, &m, offp)) { 578 return (-1); /* m have already been freed */ 579 } 580 581 /* adjust pointer */ 582 ip6 = mtod(m, struct ip6_hdr *); 583 584 /* 585 * if the payload length field is 0 and the next header field 586 * indicates Hop-by-Hop Options header, then a Jumbo Payload 587 * option MUST be included. 588 */ 589 if (ip6->ip6_plen == 0 && plen == 0) { 590 /* 591 * Note that if a valid jumbo payload option is 592 * contained, ip6_hopopts_input() must set a valid 593 * (non-zero) payload length to the variable plen. 594 */ 595 ip6stat.ip6s_badoptions++; 596 icmp6_error(m, ICMP6_PARAM_PROB, 597 ICMP6_PARAMPROB_HEADER, 598 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 599 return (-1); 600 } 601 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 602 sizeof(struct ip6_hbh)); 603 if (hbh == NULL) { 604 ip6stat.ip6s_tooshort++; 605 return (-1); 606 } 607 *nxtp = hbh->ip6h_nxt; 608 609 /* 610 * accept the packet if a router alert option is included 611 * and we act as an IPv6 router. 612 */ 613 if (rtalert != ~0 && ip6_forwarding) 614 *oursp = 1; 615 } else 616 *nxtp = ip6->ip6_nxt; 617 618 /* 619 * Check that the amount of data in the buffers 620 * is as at least much as the IPv6 header would have us expect. 621 * Trim mbufs if longer than we expect. 622 * Drop packet if shorter than we expect. 623 */ 624 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 625 ip6stat.ip6s_tooshort++; 626 m_freem(m); 627 return (-1); 628 } 629 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 630 if (m->m_len == m->m_pkthdr.len) { 631 m->m_len = sizeof(struct ip6_hdr) + plen; 632 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 633 } else { 634 m_adj(m, 635 sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 636 } 637 } 638 639 return (0); 640 } 641 642 /* scan packet for RH0 routing header. Mostly stolen from pf.c:pf_test() */ 643 int 644 ip6_check_rh0hdr(struct mbuf *m, int *offp) 645 { 646 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 647 struct ip6_rthdr rthdr; 648 struct ip6_ext opt6; 649 u_int8_t proto = ip6->ip6_nxt; 650 int done = 0, lim, off, rh_cnt = 0; 651 652 off = ((caddr_t)ip6 - m->m_data) + sizeof(struct ip6_hdr); 653 lim = min(m->m_pkthdr.len, ntohs(ip6->ip6_plen) + sizeof(*ip6)); 654 do { 655 switch (proto) { 656 case IPPROTO_ROUTING: 657 *offp = off; 658 if (rh_cnt++) { 659 /* more then one rh header present */ 660 return (1); 661 } 662 663 if (off + sizeof(rthdr) > lim) { 664 /* packet to short to make sense */ 665 return (1); 666 } 667 668 m_copydata(m, off, sizeof(rthdr), (caddr_t)&rthdr); 669 670 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 671 *offp += offsetof(struct ip6_rthdr, ip6r_type); 672 return (1); 673 } 674 675 off += (rthdr.ip6r_len + 1) * 8; 676 proto = rthdr.ip6r_nxt; 677 break; 678 case IPPROTO_AH: 679 case IPPROTO_HOPOPTS: 680 case IPPROTO_DSTOPTS: 681 /* get next header and header length */ 682 if (off + sizeof(opt6) > lim) { 683 /* 684 * Packet to short to make sense, we could 685 * reject the packet but as a router we 686 * should not do that so forward it. 687 */ 688 return (0); 689 } 690 691 m_copydata(m, off, sizeof(opt6), (caddr_t)&opt6); 692 693 if (proto == IPPROTO_AH) 694 off += (opt6.ip6e_len + 2) * 4; 695 else 696 off += (opt6.ip6e_len + 1) * 8; 697 proto = opt6.ip6e_nxt; 698 break; 699 case IPPROTO_FRAGMENT: 700 default: 701 /* end of header stack */ 702 done = 1; 703 break; 704 } 705 } while (!done); 706 707 return (0); 708 } 709 710 /* 711 * Hop-by-Hop options header processing. If a valid jumbo payload option is 712 * included, the real payload length will be stored in plenp. 713 * 714 * rtalertp - XXX: should be stored in a more smart way 715 */ 716 int 717 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, struct mbuf **mp, 718 int *offp) 719 { 720 struct mbuf *m = *mp; 721 int off = *offp, hbhlen; 722 struct ip6_hbh *hbh; 723 724 /* validation of the length of the header */ 725 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 726 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 727 if (hbh == NULL) { 728 ip6stat.ip6s_tooshort++; 729 return -1; 730 } 731 hbhlen = (hbh->ip6h_len + 1) << 3; 732 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 733 hbhlen); 734 if (hbh == NULL) { 735 ip6stat.ip6s_tooshort++; 736 return -1; 737 } 738 off += hbhlen; 739 hbhlen -= sizeof(struct ip6_hbh); 740 741 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 742 hbhlen, rtalertp, plenp) < 0) 743 return (-1); 744 745 *offp = off; 746 *mp = m; 747 return (0); 748 } 749 750 /* 751 * Search header for all Hop-by-hop options and process each option. 752 * This function is separate from ip6_hopopts_input() in order to 753 * handle a case where the sending node itself process its hop-by-hop 754 * options header. In such a case, the function is called from ip6_output(). 755 * 756 * The function assumes that hbh header is located right after the IPv6 header 757 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 758 * opthead + hbhlen is located in continuous memory region. 759 */ 760 int 761 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 762 u_int32_t *rtalertp, u_int32_t *plenp) 763 { 764 struct ip6_hdr *ip6; 765 int optlen = 0; 766 u_int8_t *opt = opthead; 767 u_int16_t rtalert_val; 768 u_int32_t jumboplen; 769 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 770 771 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 772 switch (*opt) { 773 case IP6OPT_PAD1: 774 optlen = 1; 775 break; 776 case IP6OPT_PADN: 777 if (hbhlen < IP6OPT_MINLEN) { 778 ip6stat.ip6s_toosmall++; 779 goto bad; 780 } 781 optlen = *(opt + 1) + 2; 782 break; 783 case IP6OPT_ROUTER_ALERT: 784 /* XXX may need check for alignment */ 785 if (hbhlen < IP6OPT_RTALERT_LEN) { 786 ip6stat.ip6s_toosmall++; 787 goto bad; 788 } 789 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 790 /* XXX stat */ 791 icmp6_error(m, ICMP6_PARAM_PROB, 792 ICMP6_PARAMPROB_HEADER, 793 erroff + opt + 1 - opthead); 794 return (-1); 795 } 796 optlen = IP6OPT_RTALERT_LEN; 797 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 798 *rtalertp = ntohs(rtalert_val); 799 break; 800 case IP6OPT_JUMBO: 801 /* XXX may need check for alignment */ 802 if (hbhlen < IP6OPT_JUMBO_LEN) { 803 ip6stat.ip6s_toosmall++; 804 goto bad; 805 } 806 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 807 /* XXX stat */ 808 icmp6_error(m, ICMP6_PARAM_PROB, 809 ICMP6_PARAMPROB_HEADER, 810 erroff + opt + 1 - opthead); 811 return (-1); 812 } 813 optlen = IP6OPT_JUMBO_LEN; 814 815 /* 816 * IPv6 packets that have non 0 payload length 817 * must not contain a jumbo payload option. 818 */ 819 ip6 = mtod(m, struct ip6_hdr *); 820 if (ip6->ip6_plen) { 821 ip6stat.ip6s_badoptions++; 822 icmp6_error(m, ICMP6_PARAM_PROB, 823 ICMP6_PARAMPROB_HEADER, 824 erroff + opt - opthead); 825 return (-1); 826 } 827 828 /* 829 * We may see jumbolen in unaligned location, so 830 * we'd need to perform bcopy(). 831 */ 832 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 833 jumboplen = (u_int32_t)htonl(jumboplen); 834 835 #if 1 836 /* 837 * if there are multiple jumbo payload options, 838 * *plenp will be non-zero and the packet will be 839 * rejected. 840 * the behavior may need some debate in ipngwg - 841 * multiple options does not make sense, however, 842 * there's no explicit mention in specification. 843 */ 844 if (*plenp != 0) { 845 ip6stat.ip6s_badoptions++; 846 icmp6_error(m, ICMP6_PARAM_PROB, 847 ICMP6_PARAMPROB_HEADER, 848 erroff + opt + 2 - opthead); 849 return (-1); 850 } 851 #endif 852 853 /* 854 * jumbo payload length must be larger than 65535. 855 */ 856 if (jumboplen <= IPV6_MAXPACKET) { 857 ip6stat.ip6s_badoptions++; 858 icmp6_error(m, ICMP6_PARAM_PROB, 859 ICMP6_PARAMPROB_HEADER, 860 erroff + opt + 2 - opthead); 861 return (-1); 862 } 863 *plenp = jumboplen; 864 865 break; 866 default: /* unknown option */ 867 if (hbhlen < IP6OPT_MINLEN) { 868 ip6stat.ip6s_toosmall++; 869 goto bad; 870 } 871 optlen = ip6_unknown_opt(opt, m, 872 erroff + opt - opthead); 873 if (optlen == -1) 874 return (-1); 875 optlen += 2; 876 break; 877 } 878 } 879 880 return (0); 881 882 bad: 883 m_freem(m); 884 return (-1); 885 } 886 887 /* 888 * Unknown option processing. 889 * The third argument `off' is the offset from the IPv6 header to the option, 890 * which allows returning an ICMPv6 error even if the IPv6 header and the 891 * option header are not continuous. 892 */ 893 int 894 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 895 { 896 struct ip6_hdr *ip6; 897 898 switch (IP6OPT_TYPE(*optp)) { 899 case IP6OPT_TYPE_SKIP: /* ignore the option */ 900 return ((int)*(optp + 1)); 901 case IP6OPT_TYPE_DISCARD: /* silently discard */ 902 m_freem(m); 903 return (-1); 904 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 905 ip6stat.ip6s_badoptions++; 906 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 907 return (-1); 908 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 909 ip6stat.ip6s_badoptions++; 910 ip6 = mtod(m, struct ip6_hdr *); 911 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 912 (m->m_flags & (M_BCAST|M_MCAST))) 913 m_freem(m); 914 else 915 icmp6_error(m, ICMP6_PARAM_PROB, 916 ICMP6_PARAMPROB_OPTION, off); 917 return (-1); 918 } 919 920 m_freem(m); /* XXX: NOTREACHED */ 921 return (-1); 922 } 923 924 /* 925 * Create the "control" list for this pcb. 926 * 927 * The routine will be called from upper layer handlers like tcp6_input(). 928 * Thus the routine assumes that the caller (tcp6_input) have already 929 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 930 * very first mbuf on the mbuf chain. 931 * We may want to add some infinite loop prevention or sanity checks for safety. 932 * (This applies only when you are using KAME mbuf chain restriction, i.e. 933 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 934 */ 935 void 936 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 937 { 938 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 939 940 #ifdef SO_TIMESTAMP 941 if (in6p->inp_socket->so_options & SO_TIMESTAMP) { 942 struct timeval tv; 943 944 microtime(&tv); 945 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 946 SCM_TIMESTAMP, SOL_SOCKET); 947 if (*mp) 948 mp = &(*mp)->m_next; 949 } 950 #endif 951 952 /* RFC 2292 sec. 5 */ 953 if ((in6p->inp_flags & IN6P_PKTINFO) != 0) { 954 struct in6_pktinfo pi6; 955 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 956 if (IN6_IS_SCOPE_EMBED(&pi6.ipi6_addr)) 957 pi6.ipi6_addr.s6_addr16[1] = 0; 958 pi6.ipi6_ifindex = m ? m->m_pkthdr.ph_ifidx : 0; 959 *mp = sbcreatecontrol((caddr_t) &pi6, 960 sizeof(struct in6_pktinfo), 961 IPV6_PKTINFO, IPPROTO_IPV6); 962 if (*mp) 963 mp = &(*mp)->m_next; 964 } 965 966 if ((in6p->inp_flags & IN6P_HOPLIMIT) != 0) { 967 int hlim = ip6->ip6_hlim & 0xff; 968 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 969 IPV6_HOPLIMIT, IPPROTO_IPV6); 970 if (*mp) 971 mp = &(*mp)->m_next; 972 } 973 974 if ((in6p->inp_flags & IN6P_TCLASS) != 0) { 975 u_int32_t flowinfo; 976 int tclass; 977 978 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 979 flowinfo >>= 20; 980 981 tclass = flowinfo & 0xff; 982 *mp = sbcreatecontrol((caddr_t)&tclass, sizeof(tclass), 983 IPV6_TCLASS, IPPROTO_IPV6); 984 if (*mp) 985 mp = &(*mp)->m_next; 986 } 987 988 /* 989 * IPV6_HOPOPTS socket option. Recall that we required super-user 990 * privilege for the option (see ip6_ctloutput), but it might be too 991 * strict, since there might be some hop-by-hop options which can be 992 * returned to normal user. 993 * See also RFC 2292 section 6 (or RFC 3542 section 8). 994 */ 995 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 996 /* 997 * Check if a hop-by-hop options header is contained in the 998 * received packet, and if so, store the options as ancillary 999 * data. Note that a hop-by-hop options header must be 1000 * just after the IPv6 header, which is assured through the 1001 * IPv6 input processing. 1002 */ 1003 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1004 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1005 struct ip6_hbh *hbh; 1006 int hbhlen = 0; 1007 struct mbuf *ext; 1008 1009 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1010 ip6->ip6_nxt); 1011 if (ext == NULL) { 1012 ip6stat.ip6s_tooshort++; 1013 return; 1014 } 1015 hbh = mtod(ext, struct ip6_hbh *); 1016 hbhlen = (hbh->ip6h_len + 1) << 3; 1017 if (hbhlen != ext->m_len) { 1018 m_freem(ext); 1019 ip6stat.ip6s_tooshort++; 1020 return; 1021 } 1022 1023 /* 1024 * XXX: We copy the whole header even if a 1025 * jumbo payload option is included, the option which 1026 * is to be removed before returning according to 1027 * RFC2292. 1028 * Note: this constraint is removed in RFC3542. 1029 */ 1030 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1031 IPV6_HOPOPTS, 1032 IPPROTO_IPV6); 1033 if (*mp) 1034 mp = &(*mp)->m_next; 1035 m_freem(ext); 1036 } 1037 } 1038 1039 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1040 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1041 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1042 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1043 1044 /* 1045 * Search for destination options headers or routing 1046 * header(s) through the header chain, and stores each 1047 * header as ancillary data. 1048 * Note that the order of the headers remains in 1049 * the chain of ancillary data. 1050 */ 1051 while (1) { /* is explicit loop prevention necessary? */ 1052 struct ip6_ext *ip6e = NULL; 1053 int elen; 1054 struct mbuf *ext = NULL; 1055 1056 /* 1057 * if it is not an extension header, don't try to 1058 * pull it from the chain. 1059 */ 1060 switch (nxt) { 1061 case IPPROTO_DSTOPTS: 1062 case IPPROTO_ROUTING: 1063 case IPPROTO_HOPOPTS: 1064 case IPPROTO_AH: /* is it possible? */ 1065 break; 1066 default: 1067 goto loopend; 1068 } 1069 1070 ext = ip6_pullexthdr(m, off, nxt); 1071 if (ext == NULL) { 1072 ip6stat.ip6s_tooshort++; 1073 return; 1074 } 1075 ip6e = mtod(ext, struct ip6_ext *); 1076 if (nxt == IPPROTO_AH) 1077 elen = (ip6e->ip6e_len + 2) << 2; 1078 else 1079 elen = (ip6e->ip6e_len + 1) << 3; 1080 if (elen != ext->m_len) { 1081 m_freem(ext); 1082 ip6stat.ip6s_tooshort++; 1083 return; 1084 } 1085 1086 switch (nxt) { 1087 case IPPROTO_DSTOPTS: 1088 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1089 break; 1090 1091 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1092 IPV6_DSTOPTS, 1093 IPPROTO_IPV6); 1094 if (*mp) 1095 mp = &(*mp)->m_next; 1096 break; 1097 1098 case IPPROTO_ROUTING: 1099 if (!(in6p->inp_flags & IN6P_RTHDR)) 1100 break; 1101 1102 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1103 IPV6_RTHDR, 1104 IPPROTO_IPV6); 1105 if (*mp) 1106 mp = &(*mp)->m_next; 1107 break; 1108 1109 case IPPROTO_HOPOPTS: 1110 case IPPROTO_AH: /* is it possible? */ 1111 break; 1112 1113 default: 1114 /* 1115 * other cases have been filtered in the above. 1116 * none will visit this case. here we supply 1117 * the code just in case (nxt overwritten or 1118 * other cases). 1119 */ 1120 m_freem(ext); 1121 goto loopend; 1122 1123 } 1124 1125 /* proceed with the next header. */ 1126 off += elen; 1127 nxt = ip6e->ip6e_nxt; 1128 ip6e = NULL; 1129 m_freem(ext); 1130 ext = NULL; 1131 } 1132 loopend: 1133 ; 1134 } 1135 } 1136 1137 /* 1138 * pull single extension header from mbuf chain. returns single mbuf that 1139 * contains the result, or NULL on error. 1140 */ 1141 struct mbuf * 1142 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1143 { 1144 struct ip6_ext ip6e; 1145 size_t elen; 1146 struct mbuf *n; 1147 1148 #ifdef DIAGNOSTIC 1149 switch (nxt) { 1150 case IPPROTO_DSTOPTS: 1151 case IPPROTO_ROUTING: 1152 case IPPROTO_HOPOPTS: 1153 case IPPROTO_AH: /* is it possible? */ 1154 break; 1155 default: 1156 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1157 } 1158 #endif 1159 1160 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1161 if (nxt == IPPROTO_AH) 1162 elen = (ip6e.ip6e_len + 2) << 2; 1163 else 1164 elen = (ip6e.ip6e_len + 1) << 3; 1165 1166 MGET(n, M_DONTWAIT, MT_DATA); 1167 if (n && elen >= MLEN) { 1168 MCLGET(n, M_DONTWAIT); 1169 if ((n->m_flags & M_EXT) == 0) { 1170 m_free(n); 1171 n = NULL; 1172 } 1173 } 1174 if (!n) 1175 return NULL; 1176 1177 n->m_len = 0; 1178 if (elen >= M_TRAILINGSPACE(n)) { 1179 m_free(n); 1180 return NULL; 1181 } 1182 1183 m_copydata(m, off, elen, mtod(n, caddr_t)); 1184 n->m_len = elen; 1185 return n; 1186 } 1187 1188 /* 1189 * Get pointer to the previous header followed by the header 1190 * currently processed. 1191 * XXX: This function supposes that 1192 * M includes all headers, 1193 * the next header field and the header length field of each header 1194 * are valid, and 1195 * the sum of each header length equals to OFF. 1196 * Because of these assumptions, this function must be called very 1197 * carefully. Moreover, it will not be used in the near future when 1198 * we develop `neater' mechanism to process extension headers. 1199 */ 1200 u_int8_t * 1201 ip6_get_prevhdr(struct mbuf *m, int off) 1202 { 1203 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1204 1205 if (off == sizeof(struct ip6_hdr)) 1206 return (&ip6->ip6_nxt); 1207 else { 1208 int len, nxt; 1209 struct ip6_ext *ip6e = NULL; 1210 1211 nxt = ip6->ip6_nxt; 1212 len = sizeof(struct ip6_hdr); 1213 while (len < off) { 1214 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1215 1216 switch (nxt) { 1217 case IPPROTO_FRAGMENT: 1218 len += sizeof(struct ip6_frag); 1219 break; 1220 case IPPROTO_AH: 1221 len += (ip6e->ip6e_len + 2) << 2; 1222 break; 1223 default: 1224 len += (ip6e->ip6e_len + 1) << 3; 1225 break; 1226 } 1227 nxt = ip6e->ip6e_nxt; 1228 } 1229 if (ip6e) 1230 return (&ip6e->ip6e_nxt); 1231 else 1232 return NULL; 1233 } 1234 } 1235 1236 /* 1237 * get next header offset. m will be retained. 1238 */ 1239 int 1240 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1241 { 1242 struct ip6_hdr ip6; 1243 struct ip6_ext ip6e; 1244 struct ip6_frag fh; 1245 1246 /* just in case */ 1247 if (m == NULL) 1248 panic("ip6_nexthdr: m == NULL"); 1249 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1250 return -1; 1251 1252 switch (proto) { 1253 case IPPROTO_IPV6: 1254 if (m->m_pkthdr.len < off + sizeof(ip6)) 1255 return -1; 1256 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1257 if (nxtp) 1258 *nxtp = ip6.ip6_nxt; 1259 off += sizeof(ip6); 1260 return off; 1261 1262 case IPPROTO_FRAGMENT: 1263 /* 1264 * terminate parsing if it is not the first fragment, 1265 * it does not make sense to parse through it. 1266 */ 1267 if (m->m_pkthdr.len < off + sizeof(fh)) 1268 return -1; 1269 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1270 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1271 return -1; 1272 if (nxtp) 1273 *nxtp = fh.ip6f_nxt; 1274 off += sizeof(struct ip6_frag); 1275 return off; 1276 1277 case IPPROTO_AH: 1278 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1279 return -1; 1280 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1281 if (nxtp) 1282 *nxtp = ip6e.ip6e_nxt; 1283 off += (ip6e.ip6e_len + 2) << 2; 1284 if (m->m_pkthdr.len < off) 1285 return -1; 1286 return off; 1287 1288 case IPPROTO_HOPOPTS: 1289 case IPPROTO_ROUTING: 1290 case IPPROTO_DSTOPTS: 1291 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1292 return -1; 1293 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1294 if (nxtp) 1295 *nxtp = ip6e.ip6e_nxt; 1296 off += (ip6e.ip6e_len + 1) << 3; 1297 if (m->m_pkthdr.len < off) 1298 return -1; 1299 return off; 1300 1301 case IPPROTO_NONE: 1302 case IPPROTO_ESP: 1303 case IPPROTO_IPCOMP: 1304 /* give up */ 1305 return -1; 1306 1307 default: 1308 return -1; 1309 } 1310 1311 return -1; 1312 } 1313 1314 /* 1315 * get offset for the last header in the chain. m will be kept untainted. 1316 */ 1317 int 1318 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1319 { 1320 int newoff; 1321 int nxt; 1322 1323 if (!nxtp) { 1324 nxt = -1; 1325 nxtp = &nxt; 1326 } 1327 while (1) { 1328 newoff = ip6_nexthdr(m, off, proto, nxtp); 1329 if (newoff < 0) 1330 return off; 1331 else if (newoff < off) 1332 return -1; /* invalid */ 1333 else if (newoff == off) 1334 return newoff; 1335 1336 off = newoff; 1337 proto = *nxtp; 1338 } 1339 } 1340 1341 /* 1342 * System control for IP6 1343 */ 1344 1345 u_char inet6ctlerrmap[PRC_NCMDS] = { 1346 0, 0, 0, 0, 1347 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1348 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1349 EMSGSIZE, EHOSTUNREACH, 0, 0, 1350 0, 0, 0, 0, 1351 ENOPROTOOPT 1352 }; 1353 1354 int *ipv6ctl_vars[IPV6CTL_MAXID] = IPV6CTL_VARS; 1355 1356 int 1357 ip6_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1358 void *newp, size_t newlen) 1359 { 1360 #ifdef MROUTING 1361 extern int ip6_mrtproto; 1362 extern struct mrt6stat mrt6stat; 1363 #endif 1364 int error, s; 1365 1366 /* Almost all sysctl names at this level are terminal. */ 1367 if (namelen != 1 && name[0] != IPV6CTL_IFQUEUE) 1368 return (ENOTDIR); 1369 1370 switch (name[0]) { 1371 case IPV6CTL_DAD_PENDING: 1372 return sysctl_rdint(oldp, oldlenp, newp, ip6_dad_pending); 1373 case IPV6CTL_STATS: 1374 if (newp != NULL) 1375 return (EPERM); 1376 return (sysctl_struct(oldp, oldlenp, newp, newlen, 1377 &ip6stat, sizeof(ip6stat))); 1378 #ifdef MROUTING 1379 case IPV6CTL_MRTSTATS: 1380 if (newp != NULL) 1381 return (EPERM); 1382 return (sysctl_struct(oldp, oldlenp, newp, newlen, 1383 &mrt6stat, sizeof(mrt6stat))); 1384 case IPV6CTL_MRTPROTO: 1385 return sysctl_rdint(oldp, oldlenp, newp, ip6_mrtproto); 1386 case IPV6CTL_MRTMIF: 1387 if (newp) 1388 return (EPERM); 1389 return mrt6_sysctl_mif(oldp, oldlenp); 1390 case IPV6CTL_MRTMFC: 1391 if (newp) 1392 return (EPERM); 1393 return mrt6_sysctl_mfc(oldp, oldlenp); 1394 #else 1395 case IPV6CTL_MRTSTATS: 1396 case IPV6CTL_MRTPROTO: 1397 case IPV6CTL_MRTMIF: 1398 case IPV6CTL_MRTMFC: 1399 return (EOPNOTSUPP); 1400 #endif 1401 case IPV6CTL_MTUDISCTIMEOUT: 1402 error = sysctl_int(oldp, oldlenp, newp, newlen, 1403 &ip6_mtudisc_timeout); 1404 if (icmp6_mtudisc_timeout_q != NULL) { 1405 s = splsoftnet(); 1406 rt_timer_queue_change(icmp6_mtudisc_timeout_q, 1407 ip6_mtudisc_timeout); 1408 splx(s); 1409 } 1410 return (error); 1411 case IPV6CTL_IFQUEUE: 1412 return (sysctl_niq(name + 1, namelen - 1, 1413 oldp, oldlenp, newp, newlen, &ip6intrq)); 1414 default: 1415 if (name[0] < IPV6CTL_MAXID) 1416 return (sysctl_int_arr(ipv6ctl_vars, name, namelen, 1417 oldp, oldlenp, newp, newlen)); 1418 return (EOPNOTSUPP); 1419 } 1420 /* NOTREACHED */ 1421 } 1422 1423 void 1424 ip6_send_dispatch(void *xmq) 1425 { 1426 struct mbuf_queue *mq = xmq; 1427 struct mbuf *m; 1428 struct mbuf_list ml; 1429 int s; 1430 1431 mq_delist(mq, &ml); 1432 KERNEL_LOCK(); 1433 s = splsoftnet(); 1434 while ((m = ml_dequeue(&ml)) != NULL) { 1435 ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL); 1436 } 1437 splx(s); 1438 KERNEL_UNLOCK(); 1439 } 1440 1441 void 1442 ip6_send(struct mbuf *m) 1443 { 1444 mq_enqueue(&ip6send_mq, m); 1445 task_add(softnettq, &ip6send_task); 1446 } 1447